linux-kernel - Re: [PATCH v5 3/7] dt-bindings: display: renesas,du: Add missing constraints

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Message-ID: <20241217114227.GB32392@pendragon.ideasonboard.com>
Date: Tue, 17 Dec 2024 13:42:27 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>,
	Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
	Andrzej Hajda <andrzej.hajda@...el.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Robert Foss <rfoss@...nel.org>, Jonas Karlman <jonas@...boo.se>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Magnus Damm <magnus.damm@...il.com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>, LUU HOAI <hoai.luu.ub@...esas.com>,
	Jagan Teki <jagan@...rulasolutions.com>,
	Sam Ravnborg <sam@...nborg.org>,
	Biju Das <biju.das.jz@...renesas.com>,
	dri-devel@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-clk@...r.kernel.org,
	Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
Subject: Re: [PATCH v5 3/7] dt-bindings: display: renesas,du: Add missing
 constraints

On Tue, Dec 17, 2024 at 11:59:53AM +0200, Tomi Valkeinen wrote:
> Hi,
> 
> On 17/12/2024 10:14, Geert Uytterhoeven wrote:
> > Hi Tomi,
> > 
> > On Tue, Dec 17, 2024 at 6:32 AM Tomi Valkeinen
> > <tomi.valkeinen@...asonboard.com> wrote:
> >> From: Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
> >>
> >> The binding is missing maxItems for all renesas,cmms and renesas,vsps
> >> properties. As the amount of cmms or vsps is always a fixed amount, set
> >> the maxItems to match the minItems.
> >>
> >> Also add the minItems and maxItems to the top level properties.
> >>
> >> Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
> > 
> > Thanks for your patch!
> > 
> >> --- a/Documentation/devicetree/bindings/display/renesas,du.yaml
> >> +++ b/Documentation/devicetree/bindings/display/renesas,du.yaml
> >> @@ -77,6 +77,8 @@ properties:
> >>
> >>     renesas,cmms:
> >>       $ref: /schemas/types.yaml#/definitions/phandle-array
> >> +    minItems: 1
> >> +    maxItems: 4
> >>       items:
> >>         maxItems: 1
> >>       description:
> >> @@ -85,6 +87,8 @@ properties:
> >>
> >>     renesas,vsps:
> >>       $ref: /schemas/types.yaml#/definitions/phandle-array
> >> +    minItems: 1
> >> +    maxItems: 4
> >>       items:
> >>         items:
> >>           - description: phandle to VSP instance that serves the DU channel
> >> @@ -489,9 +493,11 @@ allOf:
> >>
> >>           renesas,cmms:
> >>             minItems: 4
> >> +          maxItems: 4
> >>
> >>           renesas,vsps:
> >>             minItems: 4
> >> +          maxItems: 4
> > 
> > AFAIK these two additions are not needed, as they already match the
> > values defined at the top level.
> 
> But if we add a new SoC, which has 5 vsps, we would need to increase the 
> values in the top level. Which would then mean these are needed, and I'm 
> sure adding them could be missed.

Let's keep things consistent with maxItems specified everywhere (my
preference is to not specify the items count at the top level hereas I
don't see any value in doing so, but I won't fight on that one if it's
what it takes to get the bindings merged).

-- 
Regards,

Laurent Pinchart